
class SingletonLazy{
    private volatile static SingletonLazy instance=null;
    private static Object locker=new Object();
    public static SingletonLazy getInstance() {
       if (instance==null){
           synchronized (locker) {
               if (instance == null) {
                   instance = new SingletonLazy();
               }
           }
       }
       return instance;
    }

    private SingletonLazy(){ }
}

public class Test2 {
    public static void main(String[] args) {
        SingletonLazy s1=SingletonLazy.getInstance();
    }
}
